> Every single one of the problems in the article are due to binary-exponent / decimal-exponent mismatch and the inevitable differences in how different platforms do the conversions.
The article itself actually started with your assumption... and found it wasn't true. The type conversion wasn't the issue--it was coming back as the same value on all the different systems.
The flaw was that the sum came out wrong depending on the order that it was done. And the input numbers were (if I'm understanding correctly) computed as a / b, for some integer values a and b, which are not generally perfectly precise in decimal or binary floating point.
